"I have no idea [how serious the injury is], we have to figure it out now. It was a shock in that moment – probably the last situation of the warm-up," said Klopp, whose side moved seven points clear at the summit once more.

"He is on the ground, he wants to play. Because he doesn't speak immediately that's not so good.

"We have to wait to see what it is now. But it was a brilliant decision of the doc and Trent. They told me he could play and he played well."

England right-back Alexander-Arnold presented his own prescription that Liverpool's medical staff were happy to go along with, allowing him to complete 90 minutes.

"I told the manager and the medical staff I needed a strapping and a few painkillers and I'd be good to go," he said.